CN103575077A - Multi-layer belt type drying system - Google Patents
Multi-layer belt type drying system Download PDFInfo
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- CN103575077A CN103575077A CN201310548774.3A CN201310548774A CN103575077A CN 103575077 A CN103575077 A CN 103575077A CN 201310548774 A CN201310548774 A CN 201310548774A CN 103575077 A CN103575077 A CN 103575077A
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Abstract
The invention discloses a multi-layer belt type drying system. The multi-layer belt type drying system comprises a drying box with an exhaust port in the top and multiple layers of transmission net belts in the drying box, wherein the input end of the lower-layer transmission net belt is connected with the output end of the adjacent upper-layer transmission net belt, and a plurality of circulation fans are arranged under each layer of transmission net belt. A horizontal separation plate dividing the drying box into a drying chamber and a cooling chamber is arranged in the drying box, an air feeding port is formed in the bottom of the cooling chamber, a draught fan used for exhausting the air is arranged inside the cooling chamber, the air feeding port and the draught fan are arranged at two sides of the transmission net belts, a heater is arranged in the drying chamber, an air inlet of the heater is communicated with an air outlet of the draught fan, and a plurality of air outlets corresponding to the transmission net belts in the drying chamber one to one are formed in the heater. The multi-layer belt type drying system is simple in structure and reasonable in arrangement, preheats a heating medium by recycling waste heat of off gas and utilizing dried upgrading materials with high temperature, and lowers the energy consumption in the drying process.
Description
Technical field
The present invention relates to a kind of belt drying system, be specifically related to a kind of Multi-layer belt type drying system.
Background technology
The lignite resource reserves that China has been found that are huge and cheap, however the brown coal minimum coal that is degrees of coalification, and porosity is large, volatile matter is high, oxygen content can reach 15%～30%, moisture is high, total moisture generally can reach 20～50%, and very easily weathering in air belongs to low, middle low calorific value coal, be unfavorable for that long-distance transport stores with long-time, because moisture is high, the direct combustion power generation of undried, flame temperature is low, after-flame difficulty, the thermal efficiency is low.At present, along with the development of industrial and agricultural production and the sharp increase of urban population, a large amount of sanitary sewages and industrial wastewater have been brought, make the output of mud increasing, the municipal sludge calorific value of undried is very low, when moisture content is 80%, calorific value is only 1170KJ/kg, and its calorific value of dried municipal sludge can reach 15MJ/kg, the storage that the mud after heated drying can be stable, sells as product.
At present, the dry technology of high-moisture brown coal, coal slime, mud is divided into dehydration by evaporation technology and non-evaporating dehydrolysis technology conventionally.In dehydration by evaporation, removing of water is by directly or indirectly the heat that is equivalent to water evaporation latent heat being added on wet stock, and water is removed with the form of gaseous state; In non-evaporating dehydrolysis process, water does not undergo phase transition, and directly with liquid form, removes.Because moisture evaporation needs amount of heat, therefore traditional dry run is a high energy consumption process.
The economy and the security that how to improve high-moisture brown coal, coal slime and drying sludge, reduce dry run energy consumption effectively, improves power plant efficiency and will become problem demanding prompt solution.
Publication number is that the Chinese patent literature of CN101907383B discloses belt-conveying drying system and the method for utilizing solar energy to realize brown coal dehydration upgrading, comprise the feeding preheating chamber, drier and the discharged material cooling chamber that by belt-type conveying equipment, are connected successively, drier is divided into air preheating chamber and two parts of hothouse by a vertical partition, on partition, establish through hole, air preheating chamber is established wind entrance, hothouse is established wind outlet; Described discharged material cooling chamber is established new wind entrance, the wind outlet of discharged material cooling chamber connects the wind entrance of air preheating chamber by airduct, the wind outlet of hothouse is connected to the wind entrance of feeding preheating chamber and the wind entrance of air preheating chamber by airduct simultaneously, and the wind outlet of feeding preheating chamber is connected to coal dust piece-rate system.But owing to adopting individual layer treating apparatus, the treatment effeciency of material is lower, and equipment occupation space is larger.
Summary of the invention
The invention provides a kind of simple in structure, rational Multi-layer belt type drying system is set, by reclaim using waste heat from tail gas and utilize dry after the higher upgrading material of temperature heat medium is heated, reduced the energy consumption of dry run.This drying system, for the dry processing before transporting containing wet stock as brown coal, coal slime or mud etc., can be realized to efficient, clean utilization to material.
A system, comprises that top transmits guipure with the drying box of exhaust outlet and the multilayer that is positioned at drying box, and the input that lower floor transmits guipure is accepted the output of the adjacent transmission guipure in upper strata, and every layer is transmitted guipure below and is provided with some circulating fans;
In described drying box, be provided with and be divided into hothouse and the upper and lower two-part horizontal baffle of cooling chamber;
Described cooling chamber bottom is provided with air outlet, and inside is provided with the air-introduced machine for air draft, and described air outlet and air-introduced machine are located at the both sides of transmitting guipure;
In described hothouse, be provided with heater, the air inlet of heater is communicated with the air outlet of air-introduced machine, and heater is provided with a plurality of and interior guipure air outlet one to one that transmits of hothouse;
As preferably, in described hothouse, transmit guipure at least two-layer, in cooling chamber, transmission guipure is one deck at least.Through the dry and cooling processing of multilayer, material can obtain fully and uniformly dry.
Described transmission guipure is made by the stainless sheet steel of boring a hole, and by motor, through gearbox, is driven, and transmits guipure and can carry out speed governing by motor.Adjacent transport network interband, mesh scavenging machine is equipped with at the revolution position of lower floor's transmission guipure and upper strata transmission guipure, to remove the material particles sticking on mesh.
In described hothouse, transmit the speed of service of guipure and controlled through material bed resistance drop by air, by adjusting, transmit the speed of service of guipure and can control the distribution of heat medium again.As preferably, in described hothouse, undermost transport network tape speed is lower, makes bed of material thickening, can make most of air stream two-layer thinner material bed through what start, to improve total drying efficiency.
As preferably, the distribution density of circulating fan is every 2.5～4m
2transport network band area arranges a circulating fan.The distribution of circulating fan is gathered and is controlled in above-mentioned scope, can guarantee to transmit guipure take up an official post meaning section material abundant heat exchange and take into account economical and energy-conservation.
As preferably, described heater is fin steam heater, and the heat transfer property of fin steam heater is good and resistance is little.Heat medium reaches 135 ℃ of left and right after heating, and the superheated steam amount that this temperature is flowed through in fin steam heater is controlled, and to guarantee the security of heat transfer process, wherein, the chart that superheated steam amount can utilize empirical data to draw accurately calculates.
As preferably, described Multi-layer belt type drying system also comprises the heat exchanger of being located at outside drying box, and described heat exchanger is divided into inner and outer tubes, and drying medium is in the circulation of heat exchanger inner tube, and band waste heat tail gas circulates through heat exchanger outer tube.The air outlet of described heat exchanger inner tube is communicated with the air outlet of cooling chamber, and the air inlet of heat exchanger outer tube is communicated with the exhaust outlet of drying box by exhaust duct.
As preferably, described exhaust outlet is at least two, and each exhaust outlet place is equipped with wet-emitting blower, and all exhaust outlets gather to exhaust duct.
As preferably, described exhaust duct is provided with deduster.
As preferably, described drying box top and bottom are respectively equipped with charging aperture and discharging opening.
As preferably, the dry and cooling procedure of material is all carried out in airtight drying box, can effectively prevent the lignitoid spontaneous combustion of Partial Species material, and dry run dust can not leak, and has improved security and the feature of environmental protection of dry run.
Technological process of the present invention is as follows:
Heat medium of the present invention is air, through fragmentation, the charging aperture by drying box top enters on the transmission guipure in hothouse the wet stocks such as high-moisture brown coal, coal slime or mud, directly contact with the air of dry heating indoor, carry out convection heat transfer' heat-transfer by convection, mass transfer exchange, obtain the high temperature upgrading material after drying and dehydrating; High temperature upgrading material is transported to cooling chamber by transmitting guipure, directly contacts with the air after preheating in cooling chamber, after cooling, from the discharging opening of drying box bottom, draws off.Air in cooling chamber after preheating after contact with high temperature upgrading material by secondary preheating, in air-introduced machine introducing heater; The tail gas that the band producing in hothouse has surplus heat is discharged from exhaust outlet, passes into heat exchanger, for the preheating of fresh air after dehumidifying, dedusting.
Compared with prior art, tool of the present invention has the following advantages:
Multi-layer belt type drying system in the present invention is simple in structure, easy for installation, adopts layered arrangement, and treating capacity is large, and floor space is little, and equipment is compacter; Flexible operation, every layer of transport network tape speed can carry out independent control, can control each layer of material thickness according to drying regime, guarantee hot-air cross-flow drying wet stock, and material is in the discharging and fill process of upper and lower two-layer transmission guipure, the stacking of storeroom becomes loosening, and specific area increases, and the total productive capacity of dryer group is improved;
Native system reduces the energy consumption of dry materials process by reclaiming using waste heat from tail gas, after recycling is dry, the higher upgrading material of temperature heats heat medium, reduces further the energy consumption of dry run.
Native system is the transportation pre-treatment containing wet stock for high-moisture brown coal, coal slime, mud etc., can improve low heat valve, reduce cost of transportation; For the preposition of electricity generation system, be dried, can improve unit generation efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of Multi-layer belt type drying system of the present invention:
In figure: 1-charging aperture, 2-exhaust outlet, 3-exhaust duct, 4-wet-emitting blower, 5-drying box, 6-hothouse, 7-fin steam heater, 8-air outlet, 9-air-introduced machine, 10-cooling chamber, 11-discharging opening, 12-transmits guipure, 13-circulating fan, 14-horizontal baffle, 15-air outlet, 16-pressure fan, 17-ajutage, 18-air cleaner, 19-heat exchanger, 20-deduster.
The specific embodiment
Referring to Fig. 1, a kind of Multi-layer belt type drying system, comprise that top is with the drying box 5 of two exhaust outlets 2 and five layers of transmission guipure 12 of being made by the stainless sheet steel of boring a hole being positioned at drying box 5, the input of lower floor's transmission guipure is accepted the output of the adjacent transmission guipure in upper strata, every layer of transmission guipure below is provided with some circulating fans 13, and the distribution density of circulating fan 13 is every 2.5～4m
2transport network band area arranges one.
Multi-layer belt type drying system also comprises:
Drying box top and bottom are respectively equipped with charging aperture 1 and discharging opening 11, be provided with and be divided into hothouse 6 and the upper and lower two-part horizontal baffle 14 of cooling chamber 10 in drying box;
In cooling chamber, be provided with upper and lower two-layer transmission guipure, wherein, on the sidewall of cooling chamber left side, the position of corresponding lower floor transmission guipure is provided with air outlet 15, and air-introduced machine 9 is positioned at the right side that guipure is transmitted on upper strata.
In hothouse, be provided with three layers and transmit guipure, transmit guipure right side and be provided with a fin steam heater 7, the bottom of this heater is provided with air inlet, is communicated with the air outlet of air-introduced machine 9, and heater left side has three and transmits guipure position air outlet 8 one to one with three layers;
The part of ajutage 17 before entering heat exchanger 19 connects pressure fan 16, between ajutage 17 and pressure fan 16, is provided with again air cleaner 18; The part of exhaust duct 3 before entering heat exchanger 19 is provided with deduster 20.
Air in environment is in pressure fan is drawn into ajutage, after filtering, air cleaner enters heat exchanger inner tube, preheating in heat exchanger, by ajutage, from the air outlet of cooling chamber bottom, enter in drying box, under the suction force effect of circulating fan, the air after preheating is the directed material that passes through from bottom to top again, because this material is the high temperature upgrading material after hothouse inner drying, temperature is higher, and air absorbs the heat of material when by material, obtains secondary preheating; In the fin steam heater of air after secondary preheating in air-introduced machine enters hothouse, after heating, from three air outlets of fin steam heater, discharge respectively, air after heating transmits the material on guipure by this layer from bottom to top respectively under the effect of each layer of circulating fan, by the object of conducting heat, mass transfer exchange reaches dried material.The tail gas producing after dry is discharged in exhaust outlet, then passes in heat exchanger after wet-emitting blower hydrofuge, deduster dedusting, and the waste heat of tail gas is used for carrying out heat exchange with fresh air, preheat fresh air, and the tail gas after heat exchange directly enters in environment.
Material is inputted drying box from charging aperture after fragmentation, evenly be laid on the transmission guipure of the hothouse the superiors, transmitting under the drive of guipure, by whole hothouse, with hothouse in the heat transfer, mass transfer exchange process of hot-air, temperature of charge raises, moisture content removes.Dried material enters in cooling chamber, contacts heat exchange occurs with the air of preheating in cooling chamber, and material is cooled, and has completed the drying and dehydrating of material and cooling whole process.
Claims (8)
1. a Multi-layer belt type drying system, it is characterized in that, comprise that top transmits guipure with the drying box of exhaust outlet and the multilayer that is positioned at drying box, the input that lower floor transmits guipure is accepted the output of the adjacent transmission guipure in upper strata, and every layer is transmitted guipure below and is provided with some circulating fans;
In described drying box, be provided with and be divided into hothouse and the upper and lower two-part horizontal baffle of cooling chamber;
Described cooling chamber bottom is provided with air outlet, and inside is provided with the air-introduced machine for air draft, and described air outlet and air-introduced machine are located at the both sides of transmitting guipure;
In described hothouse, be provided with heater, the air inlet of heater is communicated with the air outlet of air-introduced machine, and heater is provided with a plurality of and interior guipure air outlet one to one that transmits of hothouse.
2. Multi-layer belt type drying system as claimed in claim 1, is characterized in that, transmits guipure in described hothouse at least two-layer, and in cooling chamber, transmission guipure is one deck at least.
3. Multi-layer belt type drying system as claimed in claim 1, is characterized in that, the distribution density of circulating fan is every 2.5～4m
2transport network band area arranges a circulating fan.
4. Multi-layer belt type drying system as claimed in claim 1, is characterized in that, described heater is fin steam heater.
5. Multi-layer belt type drying system as claimed in claim 1, it is characterized in that, also comprise the heat exchanger of being located at outside drying box, the air outlet of described heat exchanger inner tube is communicated with the air inlet of cooling chamber, and the air inlet of heat exchanger outer tube is communicated with the exhaust outlet of drying box by exhaust duct.
6. Multi-layer belt type drying system as claimed in claim 5, is characterized in that, described exhaust outlet is at least two, and each exhaust outlet place is equipped with wet-emitting blower, and all exhaust outlets gather to exhaust duct.
7. Multi-layer belt type drying system as claimed in claim 1, is characterized in that, described exhaust duct is provided with deduster.
8. Multi-layer belt type drying system as claimed in claim 1, is characterized in that, described drying box top and bottom are respectively equipped with charging aperture and discharging opening.
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